Water Pollution

The water is the most precious resource that we have on our planet, and without it the life on our planet would be impossible, since all animals need water to live. As humans we recognise this statement, but we don't "practice" it because day by day the waters get polluted because of some human acts, and that causes the dead of lot of species that live in the waters and if we consume pollute waters we're in risk too. We must recognise our problem with polluting the waters and we must stop it now before it's too late.


Source: http://www.umich.edu/~gs265/society/waterpollution.htm

Global Warming

Global warming is the increase of the average measured temperature of the Earth's surface and oceans, and it is caused by the polution made by us.
Global surface temperature increased a lot during the 100 years ending in 2005.

"The geographic distribution of surface warming during the 21st century calculated by the HadCM3 climate model if a business as usual scenario is assumed for economic growth and greenhouse gas emissions. In this figure, the globally averaged warming corresponds to 3.0 °C (5.4 °F)."

The increase of the global temperature is expected to the rising from the sea levels, an increase in the intensity of the weather events, glacier retreat, mass species extinctions...

Sources: http://en.wikipedia.org/wiki/Global_warming#Climate_models

http://upload.wikimedia.org/wikipedia/commons/a/ad/Global_Warming_Predictions_Map.jpg

Pesticides

A pesticide is a substance or mixture of substances used to kill a pest.A pesticide may be a chemical substance, biological agent (such as a virus or bacteria), antimicrobial, disinfectant or device used against any pest(insects , plant pathogens , weeds,molluscs,birds,fish ,mammals and microbes.Although there are benefits there are some disavantages such as potential toxicity to humans and other animals.

Environmental effects

Pesticide use raises a number of environmental concerns. Over 98% of sprayed insecticides and 95% of herbicides reach a destination other than their target species, including non-target species, air, water, bottom sediments, and food. pesticide drift occurs when pesticides suspended in the air as particles are carried by wind to other areas. Pesticides are one of the causes of water pollution, and some pesticides are persistent organic pollutants and contribute to soil contamination.






Consumers


There are concerns that pesticides used to control pests on food crops are dangerous to people who consume those foods.Many food crops, inclu ding fruits and vegetables, still contain pesticide residues after being washed or peeled. Chemicals that are no longer used but which are resistant to breakdown for long periods may remain in soil and water and thus in food this is a grave situation the people's health.

Sources:
http://upload.wikimedia.org/wikipedia/commons/e/e7/Hazardous-pesticide.jpg
http://help4autism.com/wp-content/uploads/2007/07/pesticides.jpg
http://www.cartoonstock.com/lowres/mba0244l.jpg
http://en.wikipedia.org/wiki/Pollution

Noise Pollution

Noise pollution is displeasing human or machine-created sound that disrupts the activity or balance of human or animal life. A common form of noise pollution is from transportation, principally motor vehicles.

The source of most of the noise comes from transportation systems like motor vehicle noise, but also including aircraft noise and rail noise.Poor urban planning may give rise to noise pollution, since side-by-side industrial and residential buildings can result in noise pollution in the residential area.

A list of other noise sources:car alarms, office equipment, factory machinery, construction work, grounds keeping equipment, barking dogs, appliances, power tools, lighting hum, audio entertainment systems, loudspeakers and noisy people.



Human health efects

Noise pollution can damage health physiological and psychological, and can cause annoyance and aggression,hypertension , high stress levels, hearing loss, sleep disturbances, and other harmful effects.
Some of those can cause other consequences like stress and hypertension can lead to depression and panic attacks.
High noise levels can contribute to cardiovascular effects and exposure to moderately high levels during a single eight hour period causes a statistical rise in blood pressure.





Environmental Effects


Noise effect on animals causes stress, increasing risk of mortality by changing the balance in predator/prey detection and avoidance, and by interfering with their use of sounds in communication especially in relation to reproduction and in navigation.

This noise pollution can leade some species to extintion one example is the beached whales , brought on by the loud sound of military sonar.

Scientists and researchers have conducted experiments that show whales song length is longer when submarine-detectors are on and when one species begins speaking louder, it will disturb other species voice, causing the whole ecosystem to eventually speak louder.





Sources:
http://en.wikipedia.org/wiki/Sound_pollution
http://blogs.venturacountystar.com/greenberg/archives/qqxsgSonarWhales.jpg
http://www.telegraph.co.uk/portal/graphics/2007/04/12/ftnoise112.jpg
http://www.kf6nvr.net/blog/archives/images/computing_stress.jpg